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/usr/src/xtables-addons-1.40/xt_length2.Kconfig is in xtables-addons-dkms 1.40-1.

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config NETFILTER_XT_MATCH_LENGTH2
	tristate '"length2" match support'
	depends on NETFILTER_XTABLES
	---help---
	This option adds the "length2" match which is an advanced form of
	xt_length that allows unambiguous layer-4/-5/-7 length matching. It is
	useful to detect empty packets or for aiding in packet scheduling.